So I just had this issue. I all of a sudden mid game got this horrible flickering in my left eye like my trackers weren't working. Did a couple tests and found it was my HDMI cable. I run a 25 foot cable from my computer so I can game in my living room so the HDMI being the issue isn't completely ridiculous. replaced it and works fine. I hope this helps. Just try another cable thats kicking around. Goodluck!